Evaluation of the Book: Di'aa al-Salihin

I have a book called (Di'aa al-Salihin) which contains all the prayers, tasbih, and supplications... and so on for all days and months. For each day, there is a prayer for that day and night, and I pray all of them without exception. Is what is in this book authentic? And is my prayer valid? Please inform us, may Allah reward you?
Answer: I do not know this book, nor do I know what is in it. What is in it must be checked against what the Shari'ah has brought, checked against the hadiths of the Prophet (peace and blessings be upon him). If it agrees with what came in the hadiths regarding the description of the prayers, then there is no harm. Many people may collect hadiths that are not authentic from the Prophet (peace and blessings be upon him), either fabricated or weak.
If you send it, we will look into it. For now, I tell you: this book and its like must be checked against the authentic books, such as al-Bukhari and Muslim, Sahih al-Bukhari and Sahih Muslim, and the other authentic books, such as Abu Dawud, al-Nasa'i, al-Tirmidhi, and Ibn Majah, meaning what is authentic in them. Likewise, Riyad al-Salihin contains authentic hadiths, and there is little weakness in it. So, you must check the hadiths in the book you have against the authentic hadiths. Whatever is unclear to you, clarify it to the scholars so they can answer you about it, such as "this hadith" and "that hadith," so that the scholars can answer your question. Yes.